Banning Billboards

Doesn't seem so bad:

Five years later, have all the businesses in São Paulo gone under? Hardly. In fact, most citizens and some advertising entities report being quite pleased with the now billboard-less city. … Anna Freitag, the marketing manager for Hewlett-Packard Brazil, said her company had never considered how inefficient billboards and the like were until they were illegal. "A billboard is media on the road," she told the FT. "In rational purchases it means less effectiveness… as people are involved in so many things that it makes it difficult to execute the call to action."